Main functions
In general, the regulator has the following functions:
• Controlling the motor speed (Variable Speed Drive), reducing the power consumption and
pressure band.
• Controlling the speed of the fans of the coolers, reducing the power consumption and noise
level.
• Protecting the compressor.
• Monitoring components - service warning.
• Automatic restart after voltage failure.
Controlling the compressor speed - reducing power consumption and pressure band
VSD compressors optimize the power consumption and reduce the operating pressure band by
matching the motor speed to the air net pressure.
The regulator will continuously vary the motor speed maintaining the net pressure as close as
possible to the programmed pressure set-point. The pressure fluctuations will be very low.
Indirect stopping
Example of a pressure/time diagram
Ref. Designation
(1) Pressure
(2) Direct stop offset
(3) Set-point
(4) Motor speed
(5) Minimum
(6) Time
(7) Load
(8) Indirect stop
(9) Start
Instruction book
APF221384 19
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